6 files changed, 10 insertions, 10 deletions
diff --git a/src/fields/AudioField.ts b/src/fields/AudioField.ts
index 8864471ae..252a5b74e 100644
--- a/src/fields/AudioField.ts
+++ b/src/fields/AudioField.ts
@@ -4,7 +4,7 @@ import { Types } from "../server/Message";
 
 export class AudioField extends BasicField<URL> {
     constructor(data: URL | undefined = undefined, id?: FieldId, save: boolean = true) {
-        super(data == undefined ? new URL("http://techslides.com/demos/samples/sample.mp3") : data, save, id);
+        super(data === undefined ? new URL("http://techslides.com/demos/samples/sample.mp3") : data, save, id);
     }
 
     toString(): string {
diff --git a/src/fields/BasicField.ts b/src/fields/BasicField.ts
index a92c4a236..3083a1937 100644
--- a/src/fields/BasicField.ts
+++ b/src/fields/BasicField.ts
@@ -46,7 +46,7 @@ export abstract class BasicField<T> extends Field {
 
     @action
     TrySetValue(value: any): boolean {
-        if (typeof value == typeof this.data) {
+        if (typeof value === typeof this.data) {
             this.Data = value;
             return true;
         }
diff --git a/src/fields/ImageField.ts b/src/fields/ImageField.ts
index a9ece7d7b..ef616b2ad 100644
--- a/src/fields/ImageField.ts
+++ b/src/fields/ImageField.ts
@@ -4,7 +4,7 @@ import { Types } from "../server/Message";
 
 export class ImageField extends BasicField<URL> {
     constructor(data: URL | undefined = undefined, id?: FieldId, save: boolean = true) {
-        super(data == undefined ? new URL("http://cs.brown.edu/~bcz/bob_fettucine.jpg") : data, save, id);
+        super(data === undefined ? new URL("http://cs.brown.edu/~bcz/bob_fettucine.jpg") : data, save, id);
     }
 
     toString(): string {
diff --git a/src/fields/ListField.ts b/src/fields/ListField.ts
index c4008bd12..815a3df73 100644
--- a/src/fields/ListField.ts
+++ b/src/fields/ListField.ts
@@ -26,7 +26,7 @@ export class ListField<T extends Field> extends BasicField<T[]> {
         }
         this.observeDisposer = observe(this.Data as IObservableArray<T>, (change: IArrayChange<T> | IArraySplice<T>) => {
             this.updateProxies()
-            if (change.type == "splice") {
+            if (change.type === "splice") {
                 UndoManager.AddEvent({
                     undo: () => this.Data.splice(change.index, change.addedCount, ...change.removed),
                     redo: () => this.Data.splice(change.index, change.removedCount, ...change.added)
@@ -57,8 +57,8 @@ export class ListField<T extends Field> extends BasicField<T[]> {
     }
     private arraysEqual(a: any[], b: any[]) {
         if (a === b) return true;
-        if (a == null || b == null) return false;
-        if (a.length != b.length) return false;
+        if (a === null || b === null) return false;
+        if (a.length !== b.length) return false;
 
         // If you don't care about the order of the elements inside
         // the array, you should sort both arrays here.
@@ -79,9 +79,9 @@ export class ListField<T extends Field> extends BasicField<T[]> {
                 var added = this.data.length < this._proxies.length;
                 var deleted = this.data.length > this._proxies.length;
                 for (let i = 0; i < dataids.length && added; i++)
-                    added = proxies.indexOf(dataids[i]) != -1;
+                    added = proxies.indexOf(dataids[i]) !== -1;
                 for (let i = 0; i < this._proxies.length && deleted; i++)
-                    deleted = dataids.indexOf(proxies[i]) != -1;
+                    deleted = dataids.indexOf(proxies[i]) !== -1;
 
                 this._processingServerUpdate = true;
                 for (let i = 0; i < proxies.length && added; i++) {
diff --git a/src/fields/PDFField.ts b/src/fields/PDFField.ts
index b6625387e..436c1cf2b 100644
--- a/src/fields/PDFField.ts
+++ b/src/fields/PDFField.ts
@@ -7,7 +7,7 @@ import { Types } from "../server/Message";
 
 export class PDFField extends BasicField<URL> {
     constructor(data: URL | undefined = undefined, id?: FieldId, save: boolean = true) {
-        super(data == undefined ? new URL("http://cs.brown.edu/~bcz/bob_fettucine.jpg") : data, save, id);
+        super(data === undefined ? new URL("http://cs.brown.edu/~bcz/bob_fettucine.jpg") : data, save, id);
     }
 
     toString(): string {
diff --git a/src/fields/VideoField.ts b/src/fields/VideoField.ts
index 626e4ec83..992cc1641 100644
--- a/src/fields/VideoField.ts
+++ b/src/fields/VideoField.ts
@@ -4,7 +4,7 @@ import { Types } from "../server/Message";
 
 export class VideoField extends BasicField<URL> {
     constructor(data: URL | undefined = undefined, id?: FieldId, save: boolean = true) {
-        super(data == undefined ? new URL("http://techslides.com/demos/sample-videos/small.mp4") : data, save, id);
+        super(data === undefined ? new URL("http://techslides.com/demos/sample-videos/small.mp4") : data, save, id);
     }
 
     toString(): string {